JP2009078739A - Filter for gas generator, and gas generator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a filter for a gas generator having the sufficient gas cooling effect, the slag capturing effect and the pressure adjusting performance, and the gas generator. <P>SOLUTION: The filter 100 for the gas generator comprises a first cylindrical filter layer 1, and a second cylindrical filter layer 2 provided on an outer circumference of the first filter layer 1 coaxially with the first filter layer 1. The first filter layer 1 and the second filter layer 2 are formed by winding one metallic wire. The density of the first filter layer 1 is 2.0×10<SP>-3</SP>to 4.0×10<SP>-3</SP>kg/cm<SP>3</SP>, and the density of the second filter layer 2 is 0.5×10<SP>-3</SP>to 3.0×10<SP>-3</SP>kg/cm<SP>3</SP>. The density of the first filter layer is higher than that of the second filter layer. Further, the gas generator has the filter 100 for the gas generator. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a gas generator filter and a gas generator used in a gas generator for inflating an air bag or the like.

When a gas generator detects an automobile collision, it ignites and burns the gas generating agent to generate hot gas, and inflates the air bag. The filter provided in this gas generator Is used for cooling and removing slag from the hot gas. As this filter for gas generators, for example, those disclosed in the following patent documents are known. The filter disclosed in Patent Document 1 is formed by winding a single wire around a cored bar. Since the filter is formed from a single wire, the manufacturing process is not complicated and the manufacturing cost can be reduced. In addition, it is possible to adjust the deployment speed of the airbag by creating a filter according to the characteristics of various vehicles. The filter disclosed in Patent Document 2 is a combination of an inner layer material and an outer layer material coaxially, and has excellent cooling performance due to two different layers.
JP 2001-171472 A JP 2001-301561 A

  However, the filter of Patent Document 1 is composed of the same layer wound while applying the same tension to all layers. When collecting slag, it is difficult to efficiently collect different types of slag such as particle size. In some cases, it is difficult to widen the combustion gas pressure range in the case, and it is difficult to obtain sufficient gas cooling performance and slag collecting effect. Moreover, since the filter of the said patent document 2 consists of two different layers, it might be difficult to hold down manufacturing cost.

  Accordingly, the present invention provides a filter for a gas generator and a gas generator that have a simple manufacturing process, can reduce manufacturing costs, have sufficient gas cooling performance and slag collection performance, and have pressure regulation performance of generated gas. The purpose is to do.

Means and effects for solving the problems

The filter for a gas generator of the present invention has a cylindrical first filter layer and a cylindrical second filter provided on the outer periphery of the first filter layer so as to be concentric with the first filter layer. The first filter layer and the second filter layer are formed by winding a single metal wire, and the density of the first filter layer is 2. 0 × 10 ^{−3 to} 4.0 × 10 ⁻³ kg / cm ³ , and the density of the second filter layer is 0.5 × 10 ^{−3 to} 3.0 × 10 ⁻³ kg / cm ³ The density of the first filter layer is higher than the density of the second filter layer.

  In the gas generator filter of the present invention, the tension for winding the metal wire in the first filter layer is 29 to 50 N, and the tension for winding the metal wire is 9 in the second filter layer. Those that are ˜40 N are preferred.

  According to the above configuration, when the gas generator is used as a part of a gas generator for an air bag, a sufficient slag collecting effect is obtained in the first layer having a higher density than the second layer. In addition, in the initial stage, heat tends to be trapped in the filter inner chamber, and higher pressure can be easily generated in the filter inside in a short time. And in the second layer having a lower density than the first layer, the cooling effect of the generated gas released to the outside of the filter can be further improved, and the pressure of the gas generated inside the filter is adjusted, Since the gas velocity can be moderated, the airbag can be deployed at an appropriate velocity. In addition, because the layer density of the filter is different as described above, it is possible to efficiently collect different types of slag such as particle size during slag collection, and it is easier to expand the combustion gas pressure range in the filter It can be. Furthermore, since it is formed by winding a single metal wire, it is easy to manufacture and the manufacturing cost can be reduced. From the above, it is possible to provide an easily manufactured gas generator filter that has sufficient slag collection performance and gas cooling performance within a certain volume and has generated gas pressure adjustment performance.

  The gas generator of the present invention includes a housing having a gas discharge hole, a combustion chamber formed in the housing and loaded with a gas generating agent that generates high-temperature gas by combustion, and an ignition agent. A gas generator comprising a gas generating agent ignition means mounted in the housing and configured to ignite and combust the gas generating agent in the combustion chamber, wherein the gas generator is provided in any one of the above directions along the inner circumference of the housing. The filter is further provided.

  According to the above configuration, since the gas generator filter having sufficient slag collection performance and gas cooling performance and also having generated gas pressure adjustment performance is provided within a certain volume, sufficient slag collection performance and gas are provided. It is possible to provide a gas generator that has a cooling performance and can deploy an airbag at an appropriate speed. In addition, since a filter that is easy to manufacture is provided, manufacturing of the gas generator itself is facilitated and manufacturing costs can be reduced.

<First Embodiment>
Hereinafter, a gas generator filter according to a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view of a gas generator filter according to a first embodiment of the present invention.

  In FIG. 1, the gas generator filter 100 is a hollow cylinder formed by winding a single metal wire into a cylindrical shape, and is formed by changing the tension once during winding. The gas generator filter 100 includes a first layer 1 located inside the filter 100 and a second layer 2 located outside the filter 100, and a space 3 is formed inside the filter 100. When the gas generator filter 100 is used as a part of a gas generator (not shown), the space 3 is loaded with a gas generating agent or the like. Moreover, iron, copper, etc. are used for a metal wire, for example.

The first layer 1 has a density of 2.0 × 10 ^{−3 to} 4.0 × 10 ⁻³ kg / cm ³ . The density may be constant or appropriately changed within the range of 2.0 × 10 ^{−3 to} 4.0 × 10 ⁻³ kg / cm ³ . Here, the first layer 1 is formed to have the above-mentioned density by winding a metal wire in a range where the tension of the metal wire is 29N to 50N. In addition, the tension | tensile_strength of a metal wire is fixed in the range of 29N-50N so that it may become in the said density range, or is changed suitably.

The second layer 2 has a density of 0.5 × 10 ^{−3 to} 3.0 × 10 ⁻³ kg / cm ³ . The density may be constant or appropriately changed within the range of 0.5 × 10 ^{−3 to} 3.0 × 10 ⁻³ kg / cm ³ . Here, the second layer 2 is formed to have the above-mentioned density by winding the metal wire in the range of the tension of the metal wire from 9N to 40N. In addition, the tension | tensile_strength of a metal wire is fixed or changed suitably in the range of 9N-40N so that it may become in the said density range. The density of the second layer 2 is lower than that of the first layer 1.

Next, the manufacturing method of the filter 100 for gas generators is demonstrated. First, a single metal wire is wound around a core material to form a hollow cylinder. Here, when winding the metal wire around the core material, a tension of 29N to 50N is applied so that the density of the filter 100 layer is 2.0 × 10 ^{−3 to} 4.0 × 10 ⁻³ kg / cm ^3. While winding the metal wire around the core material to form the first layer 1, the density of the filter 100 layer is 0.5 × 10 ^{−3 to} 3.0 × 10 ⁻³ kg / cm ³ , The second layer 2 is formed by winding a metal wire around the core while applying a tension of 9N to 40N. It is wound so that the density of the first layer 1 is higher than the density of the second layer 2. And after winding a metal wire, a core material is extracted, the wound metal wire is sintered, and a shape is fixed.

  Next, the flow of the generated gas passing through the filter 100 when the gas generator filter 100 is used as a part of the gas generator (not shown) and the gas generator is activated will be described. High temperature gas generated by igniting and burning a gas generating agent (not shown) loaded in the space 3 enters the first layer 1 from the inside of the gas generator filter 100, and slag collection and gas cooling are performed in the first layer 1. Is done. Here, the 1st layer 1 is formed so that it may become a higher density filter than the 2nd layer 2, and can collect slag with comparatively small particle size efficiently, and sufficient slag collection effect is obtained. As a result, a higher pressure can be easily generated in a short time inside the filter. The gas that has passed through the first layer 1 is also slag collected and cooled in the second layer 2. Here, the second layer 2 is formed so as to be a filter having a lower density than the first layer 1, and the remaining slag is recovered, the temperature of the gas that has passed through the first layer 1 is lowered, and the gas velocity is increased. And the gas temperature and gas velocity discharged to the outside of the filter 100 are adjusted. Then, the gas passes through the second layer 2 and is released to the outside of the filter 100 to inflate and deploy an airbag (not shown).

  According to this embodiment, it is used as a part of a gas generator for an air bag. When the gas generator is activated, a sufficient slag collecting effect is obtained in the first layer 1 having a higher density than the second layer 2. In the initial stage, heat is likely to be trapped in the inner chamber of the filter 100, and a higher pressure is easily generated in the filter 100 in a short time. And in the 2nd layer 2 whose density is lower than the 1st layer 1, while being able to further improve the cooling effect of the generated gas discharged | emitted to the filter 100 outer side, the pressure of the gas generated inside the filter 100 can be reduced. Since the gas velocity can be adjusted and adjusted, an airbag (not shown) can be inflated and deployed at an appropriate velocity. In addition, since the layer density of the first layer 1 and the second layer 2 is different, different types of slag such as particle size can be efficiently recovered during slag collection, and the combustion gas pressure in the filter 100 The width becomes easier to expand. Furthermore, since it is formed by winding a single metal wire, it is easy to manufacture and the manufacturing cost can be reduced. From the above, it is possible to provide an easily manufactured gas generator filter 100 that has sufficient slag collection performance and gas cooling performance in a certain volume and has generated gas pressure adjustment performance.

Second Embodiment
Next, an embodiment of a gas generator using a gas generator filter having the same configuration as the gas generator filter 100 according to the first embodiment of the present invention will be described. FIG. 2 is a cross-sectional view of a gas generator according to a second embodiment of the present invention. In addition, since each part to which the code | symbols 1 and 2 in the filter 100 for gas generators in 1st Embodiment are given, and each part to which the code | symbols 11 and 12 are given in this embodiment are the same in order, description May be omitted.

  In FIG. 2, the gas generator 200 is disposed along the longitudinal direction on the outer periphery of a long cylindrical housing 21 and a gas generating agent 22 that generates high-temperature gas by combustion, and includes a first layer 11 and a second layer. An enhancer cup containing a filter 23 having a layer 12, an igniter 24 that generates a flame from which the gas generating agent 22 is ignited and burned, and a transfer agent 25 that amplifies the energy of the flame generated by the igniter 24 26 and a holder 27 for caulking and fixing the igniter 24 and the enhancer cup 26, respectively. The igniter 24, the transfer agent 25, the enhancer cup 26, and the holder 27 fixed by caulking at the shaft end portion 28 of the housing 21 serve as the ignition means for the gas generating agent 22. Have.

  The housing 21 is made of an outer cylinder material 29 in which a gas discharge hole 29a is formed, and is made of, for example, a metal such as iron. From the gas discharge hole 29a, the high-temperature and high-pressure gas generated by the combustion of the gas generating agent 22 passes through the filter 23, and is cooled, filtered and discharged. In addition, a seal tape 30 is attached to the inner peripheral surface of the outer cylinder material 29 so as to close each gas discharge hole 29a. The seal tape 30 is formed in a thin strip shape with aluminum foil or the like, and adjusts the pressure during combustion of the gas generating agent 22 and prevents moisture and dust from entering the gas generator 200 from the outside. To fulfill.

  The filter 23 is formed in a hollow cylindrical shape in which a single metal wire is wound into a cylindrical shape, and includes a first layer 11 and a second layer 12. Cushion materials 31 and 32 are disposed at both ends of the hollow cylindrical portion of the filter 23.

  The cushion materials 31 and 32 are plate-like members that fix the movement of the gas generating agent filled inside the filter 23 and are disposed so as to hold the gas generating agent 22. 22 prevents powdering due to vibration of 22. The cushion material 31 is provided as a partition member between the ignition means and the gas generating agent 22, and is disposed at the end of the hollow portion inside the filter 23 on the igniter 24 side. Further, the cushion material 32 is disposed at the other end of the hollow portion inside the filter 23.

  The enhancer cup 26 has one hole 26a at the bottom and a flange 26b at the opening. A seal member 33 is affixed inside the hole 26a. Here, as a modification, the seal member 33 may be attached to the outside of the hole 26a. Further, the bottom portion of the enhancer cup 26 is in contact with the cushion material 31, and the flange 26 b is fixed by caulking with a protruding portion 27 a of the holder 27. The enhancer cup 26 is made of a metal material such as iron that is relatively hard and resistant to heat.

  The igniter 24 includes a plurality of electrode pins 24a, a plug (not shown) through which the electrode pins 24a are penetrated, a heat transfer agent (not shown) filled in the cup-shaped member 24b, and an opening of the cup-shaped member 24b. And an insulator (not shown) covering the side and the electrode pin 24a. The embolus is made of a metal such as stainless steel, aluminum, copper, or iron. The electrode pin 24a is also formed of a metal such as stainless steel, aluminum, copper, iron, etc., like the embolus. In the embolus, the periphery of the electrode pin 24a is covered with an insulator (not shown) such as glass or resin, and is insulated from each other. Further, one end of the electrode pin 24a (on the cup-shaped member 24b side) is bridged by a heat generating portion (not shown). The igniter 24 is energized and ignited based on a collision signal from a collision sensor, jets a flame into the enhancer cup 26, ignites the transfer agent 25, and then forcibly ignites and burns the gas generating agent 22. It is.

  The holder 27 holds the igniter 24 and the enhancer cup 26. The holder 27 is fitted into one end portion of the housing 21 and is held by caulking together with the shaft end portion 28 of the housing 21 to close one end of the housing 21.

  Next, the operation of the gas generator 200 will be described. When the collision sensor detects an automobile collision, a signal is sent to the igniter 24 of the gas generator 200, and an igniting agent (not shown) is ignited in the igniter 24, thereby generating gas and flame. The gas and flame of the igniter 24 are ejected into the enhancer cup 26, and the transfer agent 25 is ignited and burned efficiently. Then, the flame generated from the ignited transfer agent 25 breaks the seal member 33 and is ejected toward the gas generating agent 22 through the hole 26a, and the gas generating agent 22 is ignited and combusted. Generate efficiently.

  The generated high-temperature and high-pressure gas flows into the filter 23, and slag collection and gas cooling are performed. In particular, in the first layer 11 having a higher density than the second layer 12, slag having a relatively small particle size is efficiently recovered to obtain a sufficient slag collecting effect, and heat is easily trapped in the inner chamber of the filter 23. Thus, a higher pressure is easily generated inside the filter 23 in a short time. And in the 2nd layer 12 whose density is lower than the 1st layer 11, while remaining slag is collect | recovered efficiently, the cooling effect of the gas discharge | released outside the filter 23 can further be improved. Further, in the second layer 12, the gas pressure generated inside the filter 23 is adjusted to make the gas velocity moderate, and the gas whose gas velocity is adjusted appropriately passes through the filter 23. Thereafter, when the gas generating agent 22 further burns and the inside of the outer cylinder 29 reaches a predetermined pressure, the seal tape 30 closing each gas discharge hole 29a is ruptured, and the gas is aired from each gas discharge hole 29a. It is discharged into a bag (not shown), and the airbag is rapidly inflated and deployed.

  According to the present embodiment, since the gas generator filter 23 having sufficient slag collection performance and gas cooling performance and also having generated gas pressure adjustment performance is provided within a certain volume, sufficient slag collection performance is provided. In addition, it is possible to provide the gas generator 200 that has gas cooling performance and can deploy the airbag at an appropriate speed. In addition, since the filter 23 that is easy to manufacture is provided, the manufacturing of the gas generator 200 is facilitated, and the manufacturing cost can be reduced. Furthermore, since the density of the first layer 11 inside the filter 23 is higher than the density of the second layer 12 outside the filter 23, heat is likely to be trapped in the inner chamber of the filter 23, and a higher pressure is generated inside the filter 23 in a short time. It is possible to provide the gas generator 200 that is easy to make. And the cooling effect of the generated gas discharge | released outside the filter 23 can further be improved.

<Third Embodiment>
Next, an embodiment of a gas generator using a filter having the same configuration as the gas generator filter 100 according to the first embodiment of the present invention will be described. FIG. 3 is a cross-sectional view of a gas generator according to a third embodiment of the present invention. The filter 54 has the same configuration as that of the gas generator filter 100 according to the first embodiment. Each part of the gas generator filter 100 according to the first embodiment, to which reference numerals 11 and 12 are applied, and the present embodiment. In the figure, the parts denoted by reference numerals 41 and 42 are the same in order, and thus the description thereof may be omitted. The igniter 55 has the same configuration as that of the igniter 24 in the gas generator 200 according to the second embodiment. The igniter 55 has 24a and 24b in the igniter 24 of the gas generator 200 according to the second embodiment. Since the respective portions to which the reference numerals 55a and 55b are assigned in the present embodiment are the same in order, the description thereof may be omitted.

  In FIG. 3, a gas generator 300 includes a substantially short cylindrical housing 50 composed of a lid member 51 and a bottomed member 52, and a gas generating agent 53 that is disposed inside the housing 50 and generates high-temperature gas by combustion. , A filter 54 disposed on the inner periphery of the housing 50 and surrounding the gas generating agent 53 in the radial direction of the housing 50, an igniter 55 that ignites when energized from the outside, A cylindrical member 56 is fixed, and the holder 57 is integrated with the bottomed member 52. Retainer rings 58 and 59 and a cushion material 60 are accommodated in the outer chamber of the inner cylindrical member 56, and the retainer rings 58 and 59 are provided along the inside of the lid member 51 and the bottomed member 52, respectively. Yes. The cushion material 60 is provided along the inner side of the retainer ring 58.

  The lid member 51 has a cylindrical part 51a having a plurality of gas discharge holes 61 and a bottom part provided at one end of the cylindrical part 51a. Is made. A seal tape 62 is attached to the inner surface of the lid member 51 so as to close each gas discharge hole 61. Similarly, the bottomed member 52 has a cylindrical portion and a bottom portion, and is integrated with a holder 57 provided at the center of the bottom portion. The lid member 51 and the bottomed member 52 are fixed to each other by means of welding or the like, with the opening of the bottomed member 52 engaging near the entrance of the opening of the lid member 51. Here, examples of the material of the lid member 51 and the bottomed member 52 include metal materials such as iron, stainless steel, aluminum, and steel materials.

  The filter 54 is disposed outside the cylindrical space formed inside the housing 50 and along the inner wall of the housing 50, and includes a first layer 41 and a second layer 42. The filter 54 is fixed so as to be sandwiched between the lid member 51 and the bottomed member 52 with respect to the axial direction, and is fitted into the inner peripheral portion of the bottomed member 52 with respect to the circumferential direction. It is fixed.

  The gas generating agent 53 is loaded in the internal space surrounded by the filter 54 inside the housing 50.

  The inner cylindrical member 56 has a flame discharge hole 56 a through which a flame is released by ignition of the ignition agent 63 filled therein, and has a flange 56 b at the opening, and the flange 56 b is caulked to the holder 57. It is fixed. The inner cylinder member 56 is made of a metal material such as iron that is relatively hard and resistant to heat.

  The holder 57 is fixed integrally with the bottom of the bottomed member 52. Examples of the material of the holder 57 include those made of metal such as iron, stainless steel, aluminum, and steel.

  Next, the operation of the gas generator 300 will be described. When the collision detection device arranged in the vehicle detects a vehicle collision, the igniter 55 is ignited by the detection signal, and the ignition agent 63 in the inner cylinder material 56 is ignited by the ignition flame. The flame in which the thermal energy of the flame from the igniter 55 is increased by the ignition agent 63 is ejected from a flame ejection hole 56a formed in the inner cylindrical member 56 side cylinder portion. The flame from the flame ejection hole 56 a is ejected toward the lid member 51 and the bottomed member 52, and the gas generating agent 53 is entirely combusted, and the generated gas flows into the filter 54. In the first layer 41 having a higher density than the second layer 42, slag having a relatively small particle size is efficiently recovered to obtain a sufficient slag collecting effect, and heat is easily trapped in the inner chamber of the filter 54. A higher pressure is likely to be generated inside the filter 54 in a short time. And in the 2nd layer 42 whose density is lower than the 1st layer 41, the remaining slag is efficiently collect | recovered and the cooling effect of the gas discharge | released outside the filter 54 can further be improved. Further, in the second layer 42, the gas pressure generated inside the filter 54 is adjusted to make the gas velocity gentle, and the gas whose gas velocity is adjusted appropriately passes through the filter 54. Thereafter, when the gas pressure in the housing 50 rises and reaches a predetermined pressure, the seal tape 62 closing the gas discharge hole 61 is ruptured, and high-pressure gas is ejected from the gas discharge hole 61, and the airbag ( (Not shown) is inflated and deployed instantaneously.

  According to this embodiment, the same effect as that of the second embodiment can be obtained.

  The present invention can be modified in design without departing from the scope of the claims, and is not limited to the above embodiment. Further, the layers of the filter for the gas generator are not limited to two layers according to the present embodiment, and may be three or more layers.

It is sectional drawing of the filter for gas generators which concerns on 1st Embodiment of this invention. It is sectional drawing of the gas generator which concerns on 2nd Embodiment of this invention. It is sectional drawing of the gas generator which concerns on 3rd Embodiment of this invention.

Explanation of symbols

1, 11, 41 First layer 2, 12, 42 Second layer 3 Space 21, 50 Housing 22, 53 Gas generating agent 24, 55 Igniter 24a, 55a Electrode pin 24b, 55b Cup-shaped member 25 Transfer agent 26 Enhancer Cup 26a Hole 26b, 56b Flange 27, 57 Holder 27a Protrusion 28 Shaft end 29 Outer cylinder 29a, 61 Gas discharge hole 30, 62 Seal tape 31, 32, 60 Cushion 33 Seal member 51 Lid member 51a Cylindrical part 52 Bottomed member 56 Inner cylinder material 56a Flame discharge hole 58, 59 Retainer ring 63 Ignitant 23, 54, 100 Gas generator filter 200, 300 Gas generator

Claims (3)

A tubular first filter layer;
A cylindrical second filter layer provided on the outer periphery of the first filter layer so as to be concentric with the first filter layer;
The first filter layer and the second filter layer are formed by winding a single metal wire,
The density of the first filter layer is 2.0 × 10 ^{−3 to} 4.0 × 10 ⁻³ kg / cm ³ , and the density of the second filter layer is 0.5 × 10 ^{−3 to} 3. 0 × 10 ⁻³ kg / cm ³ ,
The gas generator filter, wherein the density of the first filter layer is higher than the density of the second filter layer. In the first filter layer, a tension for winding the metal wire is 29 to 50 N,
2. The gas generator filter according to claim 1, wherein in the second filter layer, a tension for winding the metal wire is 9 to 40 N. 3. A housing having a gas discharge hole;
A combustion chamber formed in the housing and loaded with a gas generating agent that generates a high-temperature gas by combustion;
A gas generator comprising gas ignition agent igniting means, including a gas generating agent ignition means mounted in the housing and igniting and burning the gas generating agent in the combustion chamber;
A gas generator, further comprising the filter according to claim 1 or 2 in a circumferential direction on an inner periphery of the housing.

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